Anomalous HI in NGC 2997 and the Search for High Velocity Cloud Analogs

Details Anomalous HI in NGC 2997 and the Search for High Velocity Cloud Analogs Anomalous HI in NGC 2997 and the Search for High Velocity Cloud Analogs

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1313h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #13.13; Bulletin of the American Astronomical Society, Vol. 39, p.756

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of over 100 hours worth of HI observations of the isolated, inclined spiral galaxy, NGC 2997, to search for HI clouds analogous to the High Velocity Clouds (HVCs) seen around the Milky Way. After modeling a thin disk and fitting a rotation curve to the data, we characterize the left-over anomalous HI gas that contributes to 10% of the total HI emission. The HI line profiles of NGC 2997 show evidence for the existence of a "lagging disk": gas that is rotating in the same manner as the thin disk, but whose veloctiy decreases as a function of height from the disk. In fact, the majority of the anomalous gas in NGC 2997 may be associated with this sort of feature which has been previously detected in both HI and Halpha observations in edge-on spirals such as NGC 891, NGC 5775, NGC 4302 and the inclined NGC 2403. Simple ballistic models have tried to explain the lagging disk in the context of a galactic fountain (Shapiro & Field, 1976; Bregman, 1980). However, we also detect counter-rotating HI that does not appear to be associated with either the thin disk or the lagging disk. Just as in our own Milky Way, multiple processes, including accretion (Oort, 1966), may be necessary to explain the location of this high velocity HI.

Affiliated with

Also associated with

No associations

Rating

Anomalous HI in NGC 2997 and the Search for High Velocity Cloud Analogs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Anomalous HI in NGC 2997 and the Search for High Velocity Cloud Analogs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anomalous HI in NGC 2997 and the Search for High Velocity Cloud Analogs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1474924